Ac theory

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Ac theory

  1. 1. VOLTAGE TIME AC Waveform Terms:
  2. 2. VOLTAGE PEAK TIME Peak: Maximum Positive or Negative Voltage
  3. 3. VOLTAGE PEAK TO PEAK PEAK TIME Peak to Peak: 2 x peak value
  4. 4. VOLTAGE PEAK TO PEAK PERIOD PEAK TIME Period or Wavelength: length of one complete cycle
  5. 5. VOLTAGE PEAK TO PEAK PERIOD PEAK TIME RMS: (root mean square) Peak Value x .707 ( 1/  ) RMS
  6. 6. VOLTAGE TIME Calculations: If we have 230v RMS @ 50 Hz (NZ Supply) RMS 230v 50Hz
  7. 7. VOLTAGE TIME Calculations: If we have 230v RMS @ 50 Hz (NZ Supply) Peak = 230v / .707 = 325V RMS 230v 50Hz
  8. 8. VOLTAGE TIME Calculations: If we have 230v RMS @ 50 Hz (NZ Supply) Peak = 230v / .707 = 325V RMS 230v 50Hz 325v
  9. 9. VOLTAGE TIME Calculations: If we have 230v RMS @ 50 Hz (NZ Supply) Peak = 230v / .707 = 325V Peak to Peak = 325v + 325v = 650v RMS 230v 50Hz 325v
  10. 10. VOLTAGE TIME Calculations: 50 Hz , means we have 50 cycles per second So 1 cycle = 1sec/ 50Hz = 20ms RMS 230v 50Hz 325v 20ms
  11. 11. VOLTAGE TIME Calculations: Instantaneous Value What is the value after 13ms? RMS 230v 50Hz 325v 20ms
  12. 12. VOLTAGE TIME <ul><li>Calculations: Instantaneous Value </li></ul><ul><li>What is the value after 13ms? </li></ul><ul><li>Convert ms to degrees, 20ms = 360deg </li></ul>RMS 230v 50Hz 325v 20ms
  13. 13. VOLTAGE TIME <ul><li>Calculations: Instantaneous Value </li></ul><ul><li>What is the value after 13ms? </li></ul><ul><li>Convert ms to degrees, 20ms = 360deg </li></ul><ul><li>Therefore 1ms = 18deg </li></ul>RMS 230v 50Hz 325v 20ms
  14. 14. VOLTAGE TIME <ul><li>Calculations: Instantaneous Value </li></ul><ul><li>What is the value after 13ms? </li></ul><ul><li>Convert ms to degrees, 20ms = 360deg </li></ul><ul><li>Therefore 1ms = 18deg </li></ul><ul><li>Therefore 13ms = 13 x 18deg = 234deg </li></ul>RMS 230v 50Hz 325v 20ms
  15. 15. VOLTAGE TIME Calculations: Instantaneous Value What is the value at 234 deg RMS 230v 50Hz 325v 20ms 13ms
  16. 16. VOLTAGE TIME Calculations: Instantaneous Value What is the value at 234 deg V = sin 234 x peak RMS 230v 50Hz 325v 20ms 13ms
  17. 17. VOLTAGE TIME Calculations: Instantaneous Value What is the value at 234 deg V = sin 234 x peak V = - .809 x 325v RMS 230v 50Hz 325v 20ms 13ms
  18. 18. VOLTAGE TIME Calculations: Instantaneous Value What is the value at 234 deg V = sin 234 x peak V = - .809 x 325v V = - 262v RMS 230v 50Hz 325v 20ms 13ms -262V

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